This is what the text/plain part of a notification email looks like:
The following items were added to your Stack Exchange global inbox since you last checked it on 2013-09-17: Sep, 17 Cannot upgrade bind9 comment: Different error now: Setting up bind9 (1:9.8.1.dfsg.P1-4ubuntu0.7) ... * Starting domain name ...If you no longer wish to receive updates every 3 hours, you may unsubscribe from this email. _________________________________________________________________________ Questions? Comments? Let us know on our [feedback site](http://meta.stackoverflow.com). Stack Exchange Inc. 110 William Street, 28th floor, NY NY 10038
As you can see, the only link is to meta.stackoverflow.com.
It would be nice if there were links to questions/comments.